# Different approaches of linear discriminant analysis

What are the differences in three different approaches of classification of LDA for two groups?

The three are: 1. Fisher's approach 2. regression approach 3. Bayes's approach

They will be exactly the same when the two groups have same size. But when they are of different size, how three approaches differ?

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Do you mean different approaches to classification in LDA for two groups? If yes do by Fisher's approach you mean Fisher's linear classification functions and by Bayes's approach you mean this one? –  ttnphns Jul 15 '12 at 12:19